|M.Sc Student||Goldstien Tal|
|Subject||Structure and Properties of UV Cured Adhesive System|
|Department||Department of Materials Science and Engineering||Supervisor||Professor Emeritus Arnon Siegmann (Deceased)|
This research deals with polymer systems polymerizing via ultra violet (UV) irradiation in radical mechanism. These polymer systems find many applications in our life, like coatings and adhesives. The main advantages of these polymers are: fast cure, low shrinkage, viscosity and low volatiles.
The aim of the research was to investigate the relationship between the chemical formulation and the final properties of several polymer systems, based on a single polymer system. The system contains a urethane oligomer with acrylic functionality and some monomers that act to reduce viscosity and improve the adhesion to glass and stainless steel.
The polymerization process was characterized using FTIR to determine the conversion, reaction rate, progress of reaction with time and the termination process. A variance in oligomer, photoinitiator, monomer with higher functionality, replacement of the acrylic monomer by metacrylic one was investigated. Polymerization parameters including irradiation time and irradiation flux were investigated. Thermal treatment after irradiation was characterized. Films of the irradiated polymers were characterized including swelling and extraction in acetone, tensile stress, module of elasticity and thermal transitions.
After characterization of the curing process the adhesion properties between fused silica glass and stainless steel 316L was investigated. The adhesion was characterized through stress, displacement and energy at failure. The fracture surfaces were characterized using optical microscopy.
Results showed that by changing the monomer composition, conversion, reaction rates and other polymer properties changed. Adhesion was alike to all polymer systems. Silane treatment raised tensile stress at failure and its mode changed from the glass to the stainless steel.